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Hmmmm yes but the average American reads at a grade 6 level, so I daresay UK beats USA there.
Do you have a comparable statistic for British adults, or could no one afford to fund the study?
https://literacytrust.org.uk/parents-and-families/adult-literacy/
https://www.prosperityforamerica.org/literacy-statistics/
These are what I found after searching literacy statistics for both nations. I haven’t gone and checked through the data but it seems that the UK has a lower illiteracy rate than the US.